25 research outputs found
Complete set of polarization transfer observables for the reaction at 296 MeV and 0 degrees
We report measurements of the cross section and a complete set of
polarization transfer observables for the reaction at a bombarding energy of =
296 MeV and a reaction angle of = .
The data are compared with distorted-wave impulse approximation calculations
employing the large configuration-space shell-model (SM) wave functions.
The well-known Gamow-Teller and spin-dipole (SD) states at excitation
energies of 8 MeV have been reasonably reproduced by the
calculations except for the spin--parity = state at =
5.86 MeV.
The SD resonance at 9.5 MeV appears to have more =
strength than = strength, consistent with the
calculations.
The data show significant strength in the spin-longitudinal polarized cross
section at 15 MeV, which indicates existence
of the = SD resonance as predicted in the SM calculations.Comment: 6 figures, submitted to Physical Review
Study of Thin Iron Films for Polarization Analysis of Ultracold Neutrons
The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration aims to search
for the neutron electric dipole moment (nEDM) with unprecedented precision. One
of the essential elements for the nEDM measurement is a polarization analyzer
of ultracold neutrons (UCNs), whose main component is a magnetized thin iron
film. Several thin iron films were deposited on aluminum and silicon ubstrates
and were characterized by vibrating sample magnetometry and cold-neutron
reflectometry. A magnetic field required to saturate the iron film is 12
kA/m for those on the aluminum substrates and 6.4 kA/m for the silicon
substrates. The magnetic potential of the iron films on the Si substrate was
estimated to be 2 T by the neutron reflectometry, which is sufficient
performance for an UCN polarization analyzer of the nEDM measurement.Comment: Proceedings of the 24th International Spin Symposium (SPIN 2021),
18-22 October 2021, Matsue, Japa
Dose Measurements through the Concrete and Iron Shields under the 100 to 400 MeV Quasi-Monoenergetic Neutron Field (at RCNP, Osaka Univ.)
Shielding benchmark experiments are useful to verify the accuracy of calculation methods for the radiation shielding designs of high-energy accelerator facilities. In the present work, the benchmark experiments were carried out for 244- and 387-MeV quasi-monoenergetic neutron field at RCNP of Osaka University. Neutron dose rates through the test shields, 100-300 cm thick concrete and 40-100 cm thick iron, were measured by four kinds of neutron dose equivalent monitors, three kinds of wide-energy range monitors applied to high-energy neutron fields above 20 MeV and a conventional type rem monitor for neutrons up to 20 MeV, placed behind the test shields. Measured dose rates were compared one another. Measured results with the wide-energy range monitors were in agreement one another for both the concrete and the iron shields. For the conventional type rem monitor, measured results are smaller than those with the wide-energy range monitors for the concrete shields, while that are in agreements for the iron shields. The attenuation lengths were obtained from the measurements. The lengths from all the monitors are in agreement on the whole, though some differences are shown. These results are almost same as those from others measured at several hundred MeV neutron fields
The Precision nEDM Measurement with UltraCold Neutrons at TRIUMF
The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a
precision neutron electric dipole moment (nEDM) measurement with an uncertainty
of , which is an order-of-magnitude better than
the current nEDM upper limit and enables us to test Supersymmetry. To achieve
this precision, we are developing a new high-intensity ultracold neutron (UCN)
source using super-thermal UCN production in superfluid helium (He-II) and a
nEDM spectrometer. The current development status of them is reported in this
article.Comment: Proceedings of the 24th International Spin Symposium (SPIN 2021),
18-22 October 2021, Matsue, Japa
Inclusive Proton Energy Spectra from the Deuteron Induced Reaction on Carbon at Ed=9. 0 MeV (Commemoration Issue Dedicated to Professor Takuji Yanabu on the Occasion of his Retirement)
A HTS scanning magnet and AC operation
A scanningmagnetusinghigh-temperaturesuperconductor(HTS) wire was designed, built, and tested for its suitability as a beam scanner. After successful cooling tests, the magnet performance was studied using DC and AC currents. With DC current the magnet was successfully operated to generate designed field distributions and effective length. In AC mode,the magnet was operated at frequencies of 30–59 Hz and a temperature of 77 K as well as 10–20 Hz and 20K.The power losses dissipated in the coils were measured and compared with the modelcalculations. Theo bserved losses per cycle were independent of the frequency and the scaling law of the transport current was consistent with theoretical predictions for hysteretic losses in HTS wires
Harcourt Algeranoff to Mrs Porter, 20 February 1943
8TH CHINA-JAPAN JOINT NUCLEAR PHYSICS SYMPOSIUM: (CJJNPS2012)15–19 October 201
Inelastic scattering of polarized protons to unnatural parity states in ⁴⁰Ca and ²⁸Si (Commemoration Issue Dedicated to Professor Takuji Yanabu on the Occasion of his Retirement)
Shielding experiments of concrete and iron for the 244 MeV and 387 MeV quasi-mono energetic neutrons using a Bonner sphere spectrometer (at RCNP, Osaka Univ.)
Neutron energy spectra behind concrete and iron shields were measured for quasi-monoenergetic neutrons above 200 MeV using a Bonner sphere spectrometer (BSS). Quasi-monoenergetic neutrons were produced by the 7Li(p,xn) reaction with 246-MeV and 389-MeV protons. Shielding materials are concrete blocks with thicknesses from 25 cm to 300 cm and iron blocks with thicknesses from 10 cm to 100 cm. The response function of BSS was also measured at neutron energies from 100 MeV to 387 MeV. In data analysis, the measured response function was used and the pingpong scattering effect between the BSS and the shielding material was considered. The neutron energy spectra behind the concrete and iron shields were obtained by the unfolding method using the MAXED code. Ambient dose equivalents were obtained as a function of a shield thickness successfully